Rrrright. Started writing a comment along the lines of ok, is it worth it. Decided that, heck, it'll take less keystrokes to implement this, so went on and typed these two lines. Now, it breaks a bunch of tests in `test_fit`. Explanation: fits take moments (starting values, I guess). And here: https://github.com/scipy/scipy/blob/master/scipy/stats/distributions.py#L1612
it breaks if `mu2 is None`. Moreover, you can't just call _munp here, because `goodargs` are not defined yet :-). 
Solution: move a call to _stats down to below line 1619.

One more merge conflict in gh-2724...